48 lines
1.9 KiB
Java
48 lines
1.9 KiB
Java
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/*
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* Copyright 1994-1998 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package java.util;
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/**
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* A class can implement the <code>Observer</code> interface when it
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* wants to be informed of changes in observable objects.
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*
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* @author Chris Warth
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* @see java.util.Observable
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* @since JDK1.0
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*/
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public interface Observer {
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/**
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* This method is called whenever the observed object is changed. An
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* application calls an <tt>Observable</tt> object's
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* <code>notifyObservers</code> method to have all the object's
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* observers notified of the change.
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*
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* @param o the observable object.
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* @param arg an argument passed to the <code>notifyObservers</code>
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* method.
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*/
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void update(Observable o, Object arg);
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}
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